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As per Dave's previous description high pressure is where the pipe is restricted in it's opening taps etc and holds water at the mains pressure. The low pressure pipe is where you open a tap and the water can escape. This would normally be the tap opening. In the shower you have a set of pipes...

That's OK then see the low pressure issue in my post.;) The person doing the waterproofing would not have been a plumber but either a tiler or handyman so not likely to do a pressure test. If it is the wall behind the shower rose then as you have mentioned look at the shower rose fitting and...

Generaly agree with the discussion What the cause could be 1) Grout around tiles in shower recess cracked and worn. Grout deteriorates over time, particularly when not applied diligently enough. What then happens is that the water will get in behind the tiles and if there is no water proofing...